Portable display sign



FIG. 1 is a perspective view of a portable display sign showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right side elevational view thereof, the left side being a mirror image;

FIG. 5 is a front elevational view thereof the rear being a mirror image. 

The ornamental design for a portable display sign, as shown and described. 